在北极土壤中控制和对铁和的流动性
Peter Stimmler1, Martin Obst2, Mathias Stein1
1Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Str. 84, 15374, Müncheberg, Germany.
Chemosphere
|June 1, 2023
概括
和化肥对北极土壤中的铁和流动性产生重大影响. 了解这些相互作用对于预测永久土解过程中的碳循环变化至关重要.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 北极永久土含有大量的有机碳和营养物质.
- 温度上升正在增加活性层深度,可能会调动有机物质 (OM) 和 (Si) 和 (Ca) 等元素.
- Si和Ca影响OM矿化,影响碳循环,但它们在北极土壤中与铁 (Fe) 和 (Al) 的相互作用知之甚少.
研究的目的:
- 研究Si和Ca受精对北极土壤中Fe和Al流动性的影响.
- 阐明Si和Ca相互作用与Fe和Al流动性背后的机制.
主要方法:
- 实验室化实验使用来自各北极地区的土壤样本.
- 分析Mehlich-3可提取的铁和.
- 高分辨率X射线显微镜 (STXM/NEXAFS) 用于研究矿物相.
主要成果:
- 增加的Si通过促进Fe (II) 阶段显著增强了Fe的流动性.
- 在酸性和中性土壤中,Si增加了Al的流动性,但在性土壤中降低了它.
- 在所有测试的土壤pH和OM含量条件下,Ca添加降低了Al流动性.
结论:
- 在北极土壤中,Si和Ca在调节Fe和Al流动性方面发挥着至关重要的作用.
- 这些相互作用对于理解营养循环和永久土解中的潜在污染物流动性是很重要的.
- 这些发现突出了影响北极生态系统生物地球化学过程的元素的复杂相互作用.
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